1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX) 31 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/malloc.h> 40 #include <sys/rman.h> 41 #include <sys/timeet.h> 42 #include <sys/timetc.h> 43 #include <sys/watchdog.h> 44 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 #include <machine/intr.h> 52 53 #include <arm/freescale/vybrid/vf_common.h> 54 #include <arm/freescale/vybrid/vf_dmamux.h> 55 56 #define DMAMUX_CHCFG(n) (0x1 * n) /* Channels 0-15 Cfg Reg */ 57 #define CHCFG_ENBL (1 << 7) /* Channel Enable */ 58 #define CHCFG_TRIG (1 << 6) /* Channel Trigger Enable */ 59 #define CHCFG_SOURCE_MASK 0x3f /* Channel Source (Slot) */ 60 #define CHCFG_SOURCE_SHIFT 0 61 62 struct dmamux_softc { 63 struct resource *res[4]; 64 bus_space_tag_t bst[4]; 65 bus_space_handle_t bsh[4]; 66 }; 67 68 struct dmamux_softc *dmamux_sc; 69 70 static struct resource_spec dmamux_spec[] = { 71 { SYS_RES_MEMORY, 0, RF_ACTIVE }, /* DMAMUX0 */ 72 { SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DMAMUX1 */ 73 { SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DMAMUX2 */ 74 { SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DMAMUX3 */ 75 { -1, 0 } 76 }; 77 78 static int 79 dmamux_probe(device_t dev) 80 { 81 82 if (!ofw_bus_status_okay(dev)) 83 return (ENXIO); 84 85 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux")) 86 return (ENXIO); 87 88 device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer"); 89 return (BUS_PROBE_DEFAULT); 90 } 91 92 int 93 dmamux_configure(int mux, int source, int channel, int enable) 94 { 95 struct dmamux_softc *sc; 96 int reg; 97 98 sc = dmamux_sc; 99 100 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0); 101 102 reg = 0; 103 if (enable) 104 reg |= (CHCFG_ENBL); 105 106 reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT); 107 reg |= (source << CHCFG_SOURCE_SHIFT); 108 109 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg); 110 111 return (0); 112 } 113 114 static int 115 dmamux_attach(device_t dev) 116 { 117 struct dmamux_softc *sc; 118 int i; 119 120 sc = device_get_softc(dev); 121 122 if (bus_alloc_resources(dev, dmamux_spec, sc->res)) { 123 device_printf(dev, "could not allocate resources\n"); 124 return (ENXIO); 125 } 126 127 /* Memory interface */ 128 for (i = 0; i < 4; i++) { 129 sc->bst[i] = rman_get_bustag(sc->res[i]); 130 sc->bsh[i] = rman_get_bushandle(sc->res[i]); 131 } 132 133 dmamux_sc = sc; 134 135 return (0); 136 } 137 138 static device_method_t dmamux_methods[] = { 139 DEVMETHOD(device_probe, dmamux_probe), 140 DEVMETHOD(device_attach, dmamux_attach), 141 { 0, 0 } 142 }; 143 144 static driver_t dmamux_driver = { 145 "dmamux", 146 dmamux_methods, 147 sizeof(struct dmamux_softc), 148 }; 149 150 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, 0, 0); 151